function main (userId)
    now = os.time()   
    
    
    working_time = ifInRangeHHMM(now, 20,0,8,0)
    
    
    TRACE("working_time = " .. tostring(working_time))
    if working_time then
        -- Add your code here
    end
end

function ifInRangeHHMM(now, start_hour, start_min, end_hour, end_min)
-- проверяет текущее время на попадание в диапазон час минута 
        out = false
local cur_HH, cur_MM =  tonumber(os.date("%H", now)), 
                        tonumber(os.date("%M", now))
                       
    -- TRACE("now = " .. os.date("%X %x", now) .. "              " .. cur_HH .. ":" ..  cur_MM)
    not_splitted_midnight_shift = start_hour < end_hour or start_hour == end_hour and start_min < end_min
    if not_splitted_midnight_shift then
                         
    local after_start  = (cur_HH > start_hour)  or (cur_HH == start_hour    and cur_MM >= start_min) 
    local before_end =   (cur_HH < end_hour)    or (cur_HH == end_hour      and cur_MM <= end_min)
    -- TRACE("after_start =" .. tostring(after_start))
    -- TRACE("before_end =" .. tostring(before_end))
    
    out = after_start and before_end         ; --TRACE("going to return " ..  tostring(out))                         
    else
        TRACE("ifInRangeHHMM: Range is midnight splitted")
        out = ifInRangeHHMM(now, start_hour, start_min, 23, 59) or ifInRangeHHMM(now, 0, 0, end_hour, end_min)
    end
    
    
    return out 

end